Description of problem:

In webUI, navigate to Hosts > All hosts, select one or more hosts, and notice that the Select Action drop-down appears. This is not a very user-friendly approach, as user might not realize there are any actions available until (accidentally) selecting a host. 

I suggest making the button visible at all times, and disabled (greyed out) when no hosts are selected. I'd also add a pop-up instructing users to select some hosts to unlock the key.